Which of the following describes the differences between job-order and process costing? Job-order costing is used in financial accounting while process costing is used in managerial accounting. Job-order costing can only be used by manufacturers; service enterprises must use process costing. Job-order costing is voluntary while process costing is mandatory. Job-order costing traces costs to jobs while process costing traces costs to departments and averages the costs among the units worked on during the period.